CVE-2021-30188 : Security Advisory and Response

This article provides an overview of CVE-2021-30188, a vulnerability found in the CODESYS V2 runtime system. It discusses the impact, technical details, and steps for mitigation and prevention.

Understanding CVE-2021-30188

CVE-2021-30188 is a Stack-based Buffer Overflow vulnerability discovered in the CODESYS V2 runtime system SP before version 2.4.7.55.

What is CVE-2021-30188?

The vulnerability allows attackers to potentially execute malicious code by overflowing the stack memory of the runtime system, posing a security risk to affected systems.

The Impact of CVE-2021-30188

Exploitation of this vulnerability could lead to unauthorized access, system crashes, or the execution of arbitrary code, compromising the confidentiality, integrity, and availability of the system.

Technical Details of CVE-2021-30188

The following technical details outline the specifics of the CVE-2021-30188 vulnerability.

Vulnerability Description

CODESYS V2 runtime system SP before 2.4.7.55 is susceptible to a Stack-based Buffer Overflow, which can be exploited by an attacker to gain unauthorized control over the system.

Affected Systems and Versions

All versions of CODESYS V2 runtime system SP prior to 2.4.7.55 are impacted by this vulnerability, making them susceptible to exploitation.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting specially designed input that exceeds the buffer size allocated for the stack, leading to a buffer overflow and potential code execution.

Mitigation and Prevention

To safeguard systems from CVE-2021-30188, it is essential to implement immediate steps for mitigation and adopt long-term security practices to enhance resilience.

Immediate Steps to Take

Update the CODESYS V2 runtime system to version 2.4.7.55 or later to eliminate the vulnerability.
Monitor system logs for any suspicious activities that could indicate an exploitation attempt.

Long-Term Security Practices

Regularly update and patch software to address security vulnerabilities promptly.
Conduct security assessments and penetration testing to identify and remediate potential risks.

Patching and Updates

Stay informed about security advisories and patches released by CODESYS to stay protected from emerging threats.